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Zephyr Bits, ¼ inch hex shank, 1 1/4” long
Written by Marketing Depot 
on February 05, 2007 under Item Database, Tools
… Aerospace Torq-set Power Bits …
• Screwdriver tip
• ¼ inch hex shank, 1 1/4” overall length
• ¼ inch hex shank, 1 1/4” overall length
TS170-1/4B-USA is stamped on the bit. The item number cross references to ZEPHYR tool catalog. These bits are black. Probably tempered steel for high torque.
http://www.zephyrtool.com/pdf/ZephyrScrewdriverCatalog.pdf – refer to page 15
Zephyr is a major supplier of aerospace tools